Sadly, that book doesnt seem a bit interesting to me... And I don't really see the comparison... Harry Potter has a lot more substance, and deepness.. At least for me, HP means a lot more than the Wold Brother book seems to have... So that is why, I don't see them being similar. Sure, you could compare the number of copies sold... or maybe they are both children's books (I have no idea)?

But being sold or not does not say that a book is good. Just that people bought it. You have no way of knowing if it's a good book or not.

And I'm not really interested in finding out about that Wolf Brother book.

But, for whoever is, I encourage you fullheartedly to go and read it